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Loans - Changes in Status of Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) loan
Loans Designated as TDRs
Paying under restructured terms - Number of Loans | loan	18
Paying under restructured terms - Amortized Cost | $	$ 8,829
Interest rate modification
Loans Designated as TDRs
Paying under restructured terms - Number of Loans | loan	10
Paying under restructured terms - Amortized Cost | $	$ 7,620
Term modification
Loans Designated as TDRs
Paying under restructured terms - Number of Loans | loan	8
Paying under restructured terms - Amortized Cost | $	$ 1,209

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings and paying under restructured terms.

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after troubled debt restructuring, of modified financing receivable under restructured terms.

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: